长江口航道疏浚土利用至横沙浅滩数值模拟研究  

Numerical simulation on utilization of dredged soil in Yangtze Estuary channels to Hengsha shoal

作　　者：李波 付桂[1,2] 顾峰峰 李为华 LI Bo;FU Gui;GU Feng-feng;LI Wei-hua(Yangtze Estuary Waterway Administration Bureau,Shanghai 200003,China;Shanghai Hanghong Engineering Management Co.,Ltd.,Shanghai 200137,China;Shanghai Estuarine and Coastal Science Research Center,Shanghai 201201,China;State Key Laboratory of Estuarine and Coastal Research,East China Normal University,Shanghai 200241,China)

机构地区：[1]交通运输部长江口航道管理局,上海200003 [2]上海航鸿工程管理有限公司,上海200137 [3]上海河口海岸科学研究中心,上海201201 [4]华东师范大学,河口海岸学国家重点实验室,上海200241

出　　处：《水运工程》2022年第12期106-113,共8页Port & Waterway Engineering

基　　金：上海市科学技术委员会科研计划项目(21DZ1201700、21DZ1201002)。

摘　　要：针对2020年后长江口深水航道疏浚土全部外抛至海洋倾倒区造成疏浚土资源浪费的问题,利用三维潮流泥沙数学模型SHIWM-3D对疏浚土综合利用至横沙浅滩进行固沙保滩的方案进行了数值模拟,综合分析横沙浅滩流态分布、泥沙输运扩散情况、疏浚土落淤效果以及对深水航道回淤的影响。结果表明:1)航道疏浚土吹泥上滩后部分泥沙直接落淤,部分泥沙则随涨落潮流扩散输运。2)横沙浅滩区域大潮期间呈现冲刷状态,小潮期间呈现淤积状态,疏浚土在浅滩总体表现为淤积。3)航道疏浚土吹泥上滩至横沙浅滩区域对深水航道的回淤影响不大。4)长江口航道疏浚土利用至横沙浅滩的方案是可行的,是解决2020年以后长江口航道疏浚土综合利用的可持续发展方向之一。Dredged soil in deep-water channels of the Yangtze Estuary is all dumped into marine dumping areas after 2020,which leads to waste of dredged soil resources.This paper uses a three-dimensional mathematical model of tidal current and sediment(SHIWM-3D)and numerically simulates the scheme of comprehensive utilization of dredged soil to the Hengsha shoal for sand stabilization and beach protection.In addition,the paper comprehensively analyzes the fluid flow distribution,sediment transport and diffusion,sediment deposition effect of dredged soil,and its influence on sediment deposition in deep channels.The results show that:1)Some sediments are deposited directly after the dredged soil is blown onto the beach,while others are diffused and transported with tidal currents.2)Scour and siltation states appear in the Hengsha shoal during spring and neap tides,respectively,and the dredged soil is generally deposited in the shoal.3)The deposition of the deep channels is slightly affected when the dredged soil in channels is blown onto the Hengsha shoal.4)It is feasible to apply dredged soil in Yangtze Estuary channels to Hengsha shoal,which provides a direction for sustainable and comprehensive utilization of dredged soil in Yangtze Estuary channels after 2020.

关 键 词：长江口航道 疏浚土 横沙浅滩 输运 淤积 

分 类 号：U616[交通运输工程—船舶及航道工程]